Real Time Clock (Rtc); Block Diagram - Toshiba TLCS-900/H1 Series Manual

Original cmos 32-bit microcontroller

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3.20 Real time clock (RTC)

Function description for RTC

1) Clock function (hour, minute, second)

2) Calendar function (month and day, day of the week, and leap year)

3) 24 or 12-hour (AM/PM) clock function

4) +/- 30 second adjustment function (by software)

5) Alarm function (Alarm output)

6) Alarm interrupt generate

Note 1: Western calendar year column:

This product uses only the final two digits of the year. Therefore, the year following 99 is 00 years. In use,

please take into account the first two digits when handling years in the western calendar.

Note 2: Leap year:

A leap year is divisible by 4, but the exception is any leap year which is divisible by 100; this is not considered

a leap year. However, any year which is divisible by 400, is a leap year. This product does not take into

account the above exceptions . Since this product accounts only for leap years divisible by 4, please adjust the

system for any problems.

Alarm Register

Internal data bus

Figure 3.20.1 RTC block diagram